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CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317486 Presence of halogen in organic compounds can be detected using

1 Leibigs' test

2 Duma's test

3 Kjeldabl's test

4 Beilstein test

Explanation:

Beilstein test: A wire is heated and dipped into the sample and again introduced in the flame. If blue/green colour appears, a halogen $(Cl, Br$ or I) may be present. Therefore with this test presence of halogen in organic compound can be detected.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317487 During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into

1

{NaNO}_{2}

2

{NaNH}_{2}

3

NaCN

4

NaNC

Explanation:

When an organic compound is fused with sodium metal, nitrogen of the compound is converted to sodium cyanide.
$Na + C + N \to NaCN$
This is called Lassaigne's test. This test is performed for the detection of $N, S$ or halogens in organic compounds.

KCET - 2011

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317488 A solution of ${FeCl}_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a prussian blue precipitate due to the formation of

1

K [{Fe}_{2} (CN)_{6}]

2

Fe [Fe (CN)_{6}]

3

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

Explanation:

Ferric ferrocyanide, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ is formed.
$4 FeC l_{3} + 3 K_{4} [Fe {(CN)}_{6}] \to$
$\begin{matrix} F e_{4} {[F e {(C N)}_{6}]}_{3} + 12 K C l \\ \begin{array}{l} P r u s s i a n b l u e \\ c o l o u r p r e c i p i t a t e \end{array} \end{matrix}$

JEE - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317489 Which of the following nitrogen containing compound does not give Lassaigne's test?

1 Glycene

2 Hydrazine

3 Phenyl hydrazine

4 Urea

Explanation:

Hydrazine $(N_{2} H_{4})$ does not contain any carbon atom attached to nitrogen and fails to give Lassaigne's test. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317486 Presence of halogen in organic compounds can be detected using

1 Leibigs' test

2 Duma's test

3 Kjeldabl's test

4 Beilstein test

Explanation:

Beilstein test: A wire is heated and dipped into the sample and again introduced in the flame. If blue/green colour appears, a halogen $(Cl, Br$ or I) may be present. Therefore with this test presence of halogen in organic compound can be detected.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317487 During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into

1

{NaNO}_{2}

2

{NaNH}_{2}

3

NaCN

4

NaNC

Explanation:

When an organic compound is fused with sodium metal, nitrogen of the compound is converted to sodium cyanide.
$Na + C + N \to NaCN$
This is called Lassaigne's test. This test is performed for the detection of $N, S$ or halogens in organic compounds.

KCET - 2011

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317488 A solution of ${FeCl}_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a prussian blue precipitate due to the formation of

1

K [{Fe}_{2} (CN)_{6}]

2

Fe [Fe (CN)_{6}]

3

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

Explanation:

Ferric ferrocyanide, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ is formed.
$4 FeC l_{3} + 3 K_{4} [Fe {(CN)}_{6}] \to$
$\begin{matrix} F e_{4} {[F e {(C N)}_{6}]}_{3} + 12 K C l \\ \begin{array}{l} P r u s s i a n b l u e \\ c o l o u r p r e c i p i t a t e \end{array} \end{matrix}$

JEE - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317489 Which of the following nitrogen containing compound does not give Lassaigne's test?

1 Glycene

2 Hydrazine

3 Phenyl hydrazine

4 Urea

Explanation:

Hydrazine $(N_{2} H_{4})$ does not contain any carbon atom attached to nitrogen and fails to give Lassaigne's test. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317486 Presence of halogen in organic compounds can be detected using

1 Leibigs' test

2 Duma's test

3 Kjeldabl's test

4 Beilstein test

Explanation:

Beilstein test: A wire is heated and dipped into the sample and again introduced in the flame. If blue/green colour appears, a halogen $(Cl, Br$ or I) may be present. Therefore with this test presence of halogen in organic compound can be detected.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317487 During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into

1

{NaNO}_{2}

2

{NaNH}_{2}

3

NaCN

4

NaNC

Explanation:

When an organic compound is fused with sodium metal, nitrogen of the compound is converted to sodium cyanide.
$Na + C + N \to NaCN$
This is called Lassaigne's test. This test is performed for the detection of $N, S$ or halogens in organic compounds.

KCET - 2011

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317488 A solution of ${FeCl}_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a prussian blue precipitate due to the formation of

1

K [{Fe}_{2} (CN)_{6}]

2

Fe [Fe (CN)_{6}]

3

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

Explanation:

Ferric ferrocyanide, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ is formed.
$4 FeC l_{3} + 3 K_{4} [Fe {(CN)}_{6}] \to$
$\begin{matrix} F e_{4} {[F e {(C N)}_{6}]}_{3} + 12 K C l \\ \begin{array}{l} P r u s s i a n b l u e \\ c o l o u r p r e c i p i t a t e \end{array} \end{matrix}$

JEE - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317489 Which of the following nitrogen containing compound does not give Lassaigne's test?

1 Glycene

2 Hydrazine

3 Phenyl hydrazine

4 Urea

Explanation:

Hydrazine $(N_{2} H_{4})$ does not contain any carbon atom attached to nitrogen and fails to give Lassaigne's test. So, the correct option is (2).

JEE Main - 2024

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317486 Presence of halogen in organic compounds can be detected using

1 Leibigs' test

2 Duma's test

3 Kjeldabl's test

4 Beilstein test

Explanation:

Beilstein test: A wire is heated and dipped into the sample and again introduced in the flame. If blue/green colour appears, a halogen $(Cl, Br$ or I) may be present. Therefore with this test presence of halogen in organic compound can be detected.

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317487 During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into

1

{NaNO}_{2}

2

{NaNH}_{2}

3

NaCN

4

NaNC

Explanation:

When an organic compound is fused with sodium metal, nitrogen of the compound is converted to sodium cyanide.
$Na + C + N \to NaCN$
This is called Lassaigne's test. This test is performed for the detection of $N, S$ or halogens in organic compounds.

KCET - 2011

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317488 A solution of ${FeCl}_{3}$ when treated with $K_{4} [Fe (CN)_{6}]$ gives a prussian blue precipitate due to the formation of

1

K [{Fe}_{2} (CN)_{6}]

2

Fe [Fe (CN)_{6}]

3

{Fe}_{4} {[Fe (CN)_{6}]}_{3}

4

{Fe}_{3} {[Fe (CN)_{6}]}_{2}

Explanation:

Ferric ferrocyanide, ${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ is formed.
$4 FeC l_{3} + 3 K_{4} [Fe {(CN)}_{6}] \to$
$\begin{matrix} F e_{4} {[F e {(C N)}_{6}]}_{3} + 12 K C l \\ \begin{array}{l} P r u s s i a n b l u e \\ c o l o u r p r e c i p i t a t e \end{array} \end{matrix}$

JEE - 2023

CHXI12:ORGANIC CHEMISTRY SOME BASIC PRINCIPLES AND TECHNIQUES

317489 Which of the following nitrogen containing compound does not give Lassaigne's test?

1 Glycene

2 Hydrazine

3 Phenyl hydrazine

4 Urea

Explanation:

Hydrazine $(N_{2} H_{4})$ does not contain any carbon atom attached to nitrogen and fails to give Lassaigne's test. So, the correct option is (2).

JEE Main - 2024